@Entity
public class Parent implements Serializable {

    private static final long serialVersionUID = 1L;
   
    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String name;
    @OneToMany
    private Set<Child> children;
   
    public Parent() {
    }
   
    public Parent(String name) {
        this.name = name;
        this.children = new HashSet<Child>();
    }

    public Long getId() {
        return id;
    }
   
    public String getName() {
        return name;
    }
   
    public void setName(String name) {
        this.name = name;
    }
   
    public void addChild(Child child) {
        this.children.add(child);
    }
   
    public Set<Child> getChildren() {
        return this.children;
    }
}

@Entity
public class Child implements Serializable {

    private static final long serialVersionUID = 1L;
   
    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String name;
   
    public Child() {
    }
   
    public Child(String name) {
        this.name = name;
    }

    public Long getId() {
        return id;
    }

    public String getName() {
        return name;
    }
   
    public void setName(String name) {
        this.name = name;
    }
}

public class CascadeTest extends TestCase {

    private Session session;

    @Override
    protected void setUp() throws Exception {
        AnnotationConfiguration annotationConfiguration = new AnnotationConfiguration();
        SessionFactory sessionFactory = annotationConfiguration
            .addAnnotatedClass(Parent.class)
            .addAnnotatedClass(Child.class)
            .setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect")
            .setProperty("hibernate.connection.username", "username")
            .setProperty("hibernate.connection.password", "password")
            .setProperty("hibernate.connection.driver_class", "com.mysql.jdbc.Driver")
            .setProperty("hibernate.connection.url", "jdbc:mysql://localhost/development_db")
            .setProperty("hibernate.show_sql", "true")
            .buildSessionFactory();
        session = sessionFactory.openSession();
       
        new SchemaExport(annotationConfiguration, session.connection()).create(true, true);
    }
   
    @Override
    protected void tearDown() throws Exception {
        session.close();
    }
   
    public void testCascade() throws Exception {
        // create and save the child
        Child child = new Child("child");
        session.saveOrUpdate(child);
        session.flush();
        Long childId = child.getId();
        assertNotNull(childId);
       
        // create the parent, add the child and save the parent
        Parent parent = new Parent("parent");
        parent.addChild(child);
        session.saveOrUpdate(parent);
        session.flush();
        assertNotNull(parent.getId());
       
        // modify the child and save the parent
        child.setName("new child name");
        session.saveOrUpdate(parent);
       
        session.flush();
        session.clear();
       
        // test that the child has not been modified
        Child newChild = (Child) session.createCriteria(Child.class).add(Restrictions.eq("id", childId)).uniqueResult();
        assertEquals("child", newChild.getName());
    }
   
}